Support adding/removing metadata Responsible Parties

[Bronstrom]

Description

As a catalog author, I want to add/remove Responsible Parties in regard to metadata.

Acceptance Criteria

• Additional Responsible Parties can be added
• Responsible Parties can be removed

Proposed Solution

No response

Additional Notes

No response

Implementation

• I can (or plan to) submit a pull request to implement this
• Implementing this may result in a breaking change

[Bronstrom]

Depends on #795